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sip003.go
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sip003.go
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// Copyright (C) 2020, IrineSistiana
//
// This file is part of simple-tls.
//
// simple-tls is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// simple-tls is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package core
import (
"errors"
"flag"
"net"
"os"
"strings"
)
var ErrBrokenSIP003Args = errors.New("invalid SIP003 args")
//SIP003Args contains sip003 args
type SIP003Args struct {
SS_REMOTE_HOST string
SS_REMOTE_PORT string
SS_LOCAL_HOST string
SS_LOCAL_PORT string
SS_PLUGIN_OPTIONS string
VPN bool
TFO bool
}
func (args *SIP003Args) GetRemoteAddr() string {
return net.JoinHostPort(args.SS_REMOTE_HOST, args.SS_REMOTE_PORT)
}
func (args *SIP003Args) GetLocalAddr() string {
return net.JoinHostPort(args.SS_LOCAL_HOST, args.SS_LOCAL_PORT)
}
//GetSIP003Args get sip003 args from os.Environ(), if no args, returns nil
func GetSIP003Args() (*SIP003Args, error) {
srh, srhOk := os.LookupEnv("SS_REMOTE_HOST")
srp, srpOk := os.LookupEnv("SS_REMOTE_PORT")
slh, slhOk := os.LookupEnv("SS_LOCAL_HOST")
slp, slpOk := os.LookupEnv("SS_LOCAL_PORT")
spo, spoOk := os.LookupEnv("SS_PLUGIN_OPTIONS")
if srhOk || srpOk || slhOk || slpOk || spoOk { // has at least one arg
if !(srhOk && srpOk && slhOk && slpOk) { // but not has all 4 args
return nil, ErrBrokenSIP003Args
}
} else {
return nil, nil // can't find any sip003 arg
}
additional := flag.NewFlagSet("additional", flag.ContinueOnError)
tfo := additional.Bool("fast-open", false, "")
vpn := additional.Bool("V", false, "")
additional.Parse(os.Args[1:])
return &SIP003Args{
SS_REMOTE_HOST: srh,
SS_REMOTE_PORT: srp,
SS_LOCAL_HOST: slh,
SS_LOCAL_PORT: slp,
SS_PLUGIN_OPTIONS: spo,
TFO: *tfo,
VPN: *vpn,
}, nil
}
//FormatSSPluginOptions formats SS_PLUGIN_OPTIONS to command alike formation, `-s -a value`
func FormatSSPluginOptions(spo string) ([]string, error) {
commandLineOption := make([]string, 0)
op := strings.Split(spo, ";")
for _, so := range op {
optionPair := strings.SplitN(so, "=", 2)
switch len(optionPair) {
case 1:
commandLineOption = append(commandLineOption, "-"+optionPair[0])
case 2:
commandLineOption = append(commandLineOption, "-"+optionPair[0], optionPair[1])
default:
panic("unexpected pair size")
}
}
return commandLineOption, nil
}